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Hendek, nestled in the Sakarya Province of Turkey, occupies a geographically significant position within the country’s Black Sea region. Located at coordinates 40.8050, 30.7492, the city is situated inland, approximately 25 kilometers south of the Black Sea coast. The terrain is characterized by rolling hills and valleys, typical of the North Anatolian mountain range foothills, with an elevation ranging between 150-300 meters above sea level. This topography influences air circulation patterns, potentially creating localized pockets of stagnant air. Hendek is surrounded by a mix of agricultural land – Sakarya is a major hazelnut growing region – and increasingly, light industrial activity related to food processing and manufacturing. The urban-rural gradient is relatively sharp, with agricultural areas immediately bordering the city limits. The proximity to the Black Sea, while not directly on the coast, introduces maritime influences on local weather patterns, including increased humidity and potential for sea breezes. However, these breezes are often blocked by the intervening hills. The city’s location within a valley can exacerbate pollution build-up, particularly during temperature inversions, trapping pollutants emitted from residential heating and industrial sources. Understanding this interplay between terrain, land use, and meteorological conditions is crucial for assessing and mitigating air quality challenges in Hendek.

Hendek experiences a temperate climate with distinct seasonal variations that significantly impact air quality. Winters (December-February) are typically cold and damp, with increased reliance on coal and wood for residential heating, leading to elevated particulate matter (PM2.5 and PM10) concentrations. Temperature inversions are common during these months, trapping pollutants near the ground. Spring (March-May) sees improving conditions as temperatures rise and heating demand decreases, though agricultural burning of crop residue can temporarily worsen air quality. Summer (June-August) generally offers the cleanest air, benefiting from prevailing winds and reduced heating needs. However, high temperatures can promote the formation of ground-level ozone, particularly downwind of industrial areas. Autumn (September-November) is a transitional period, with increasing heating demand and potential for stagnant air masses. October and November often see a resurgence of particulate matter pollution. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and autumn months. Monitoring wind direction is advisable, avoiding areas downwind from industrial zones during calm summer days. The wet season, primarily from November to February, can offer temporary relief through pollutant washout, but also increases humidity and potential for mold growth.